openmp: Fix up taskloop reduction ICE if taskloop has no iterations [PR100471]

When a taskloop doesn't have any iterations, GOMP_taskloop* takes an early
return, doesn't create any tasks and more importantly, doesn't create
a taskgroup and doesn't register task reductions.  But, the code emitted
in the callers assumes task reductions have been registered and performs
the reduction handling and task reduction unregistration.  The pointer
to the task reduction private variables is reused, on input it is the alignment
and only on output it is the pointer, so in the case taskloop with no iterations
the caller attempts to dereference the alignment value as if it was a pointer
and crashes.  We could in the early returns register the task reductions
only to have them looped over and unregistered in the caller, but I think
it is better to tell the caller there is nothing to task reduce and bypass
all that.

2021-05-11  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/100471
	* omp-low.c (lower_omp_task_reductions): For OMP_TASKLOOP, if data
	is 0, bypass the reduction loop including
	GOMP_taskgroup_reduction_unregister call.

	* taskloop.c (GOMP_taskloop): If GOMP_TASK_FLAG_REDUCTION and not
	GOMP_TASK_FLAG_NOGROUP, when doing early return clear the task
	reduction pointer.
	* testsuite/libgomp.c/task-reduction-4.c: New test.

(cherry picked from commit 98acbb3111fcb5e57d5e63d46c0d92f4e53e3c2a)

2 files changed, 38 insertions, 5 deletions

diff --git a/libgomp/taskloop.c b/libgomp/taskloop.c
index c347624..1d8ba3a 100644
--- a/libgomp/taskloop.c
+++ b/libgomp/taskloop.c
@@ -51,20 +51,32 @@ GOMP_taskloop (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
 
   /* If parallel or taskgroup has been cancelled, don't start new tasks.  */
   if (team && gomp_team_barrier_cancelled (&team->barrier))
-    return;
+    {
+    early_return:
+      if ((flags & (GOMP_TASK_FLAG_NOGROUP | GOMP_TASK_FLAG_REDUCTION))
+	  == GOMP_TASK_FLAG_REDUCTION)
+	{
+	  struct gomp_data_head { TYPE t1, t2; uintptr_t *ptr; };
+	  uintptr_t *ptr = ((struct gomp_data_head *) data)->ptr;
+	  /* Tell callers GOMP_taskgroup_reduction_register has not been
+	     called.  */
+	  ptr[2] = 0;
+	}
+      return;
+    }
 
 #ifdef TYPE_is_long
   TYPE s = step;
   if (step > 0)
     {
       if (start >= end)
-	return;
+	goto early_return;
       s--;
     }
   else
     {
       if (start <= end)
-	return;
+	goto early_return;
       s++;
     }
   UTYPE n = (end - start + s) / step;
@@ -73,13 +85,13 @@ GOMP_taskloop (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
   if (flags & GOMP_TASK_FLAG_UP)
     {
       if (start >= end)
-	return;
+	goto early_return;
       n = (end - start + step - 1) / step;
     }
   else
     {
       if (start <= end)
-	return;
+	goto early_return;
       n = (start - end - step - 1) / -step;
     }
 #endif
diff --git a/libgomp/testsuite/libgomp.c/task-reduction-4.c b/libgomp/testsuite/libgomp.c/task-reduction-4.c
new file mode 100644
index 0000000..7ca1d02
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/task-reduction-4.c
@@ -0,0 +1,21 @@
+/* PR middle-end/100471 */
+
+extern void abort (void);
+
+int c;
+
+int
+main ()
+{
+#pragma omp parallel
+#pragma omp single
+  {
+    int r = 0, i;
+    #pragma omp taskloop reduction(+:r)
+    for (i = 0; i < c; i++)
+      r++;
+    if (r != 0)
+      abort ();
+  }
+  return 0;
+}